McCormick County Water & Sewer Authority water quality
McCormick, SC · serves 8,500 people (6,701 connections) · Purchased surface water · Local government · EPA ID SC3520002
Data: U.S. EPA · How we read the data · How we check it
Buys water from McCormick Commission of Public Works, Columbia County Water System, Town of Calhoun Falls. Treated water bought from another system can carry that system's contaminants.
Summary
PFAS above the 2024 federal limits. Systems have until 2029 to meet the PFAS limits.
Is it an emergency? No: PFAS limits are about years of exposure, not a glass of water, and nothing in EPA's data calls for you to stop drinking the water today. If your utility ever issues a boil-water or do-not-drink notice, follow it.
- PFAS
- Above limitPFOS above the federal limit in EPA's 2023–2025 testing (PFOS 7.88 ppt vs a limit of 4 ppt, where ppt = parts per trillion).
- Lead
- Below action level0 ppb (parts per billion) at the 90th percentile: 9 in 10 homes sampled were at or below it. Action level 15 ppb, falling to 10 ppb in Nov 2027. Monitoring period ending Dec 2025. Your home's pipes can make yours higher.
- Violations
- Resolved10 health-based violations since 2016, most recently Jan 2023.
- Pregnant, or mixing baby formula with tap water? Babies drink more water for their size, so PFAS exposure matters more for them. Consider bottled water or a filter certified for PFAS for formula, and ask your doctor. Health effects.
- To lower your PFAS exposure now, a home filter certified for PFAS reduction works (reverse osmosis, or activated carbon certified to NSF/ANSI 53 or 58). Filters for these results.
- Built before 1986, or not sure what your service line is made of? Check your service line and test your tap. Utility data can't show your pipes.
- Tested your own tap? Compare your result with these numbers. Moving? Compare this system with another.
- Read McCormick County Water & Sewer Authority's annual water quality report (Consumer Confidence Report). It lists every regulated contaminant tested and is usually on the utility's website or mailed with your bill, and you can also request it at (864) 852-2231. EPA: how to find it.
PFAS (“forever chemicals”)
EPA UCMR 5: 3 entry points tested Jan 2023 to Oct 2023. "Average" is the highest entry-point average (non-detects counted as zero), the way EPA compares UCMR 5 results to the limits. ppt = parts per trillion. These results do not determine compliance.
| Contaminant | Highest average |
|---|---|
| PFOA Not detected Limit 4 ppt | – |
| PFOS Above limit Limit 4 ppt | 7.88 ppt 1.97× the limit |
| PFHxS Not detected Limit 10 ppt | – |
| PFNA Not detected Limit 10 ppt | – |
| HFPO-DA (GenX) Detected, below limit Limit 10 ppt | 1.65 ppt 17% of the limit |
| Hazard Index (a combined score for PFHxS, PFNA, GenX and PFBS, where above 1 is over the limit) Detected, below limit Limit 1 | 0.17 |
| PFBS Detected, below limit Guideline 2,000 ppt | 2.08 ppt |
| PFBA Not detected Guideline 6,000 ppt | – |
| PFHxA Detected, below limit Guideline 3,000 ppt | 0.85 ppt |
| PFPeA Detected, no limit | 0.85 ppt |
For context: the PFOS average is higher than at 90% of the South Carolina systems EPA tested.
29 PFAS tested, 5 detected at least once. "Not detected" means below EPA's reporting limit (about 2 to 20 ppt depending on the chemical), not proven zero. PFAS not listed were not detected. The limits for PFHxS, PFNA, GenX and the Hazard Index were proposed for rescission in May 2026. That proposal is not final. Systems have until 2029 to meet the limits.
Lithium
Not detected in 12 samples (reporting limit 9 ppb). About lithium.
Lead and copper
Latest 90th percentile: 0 ppb lead (Jan 2023 – Dec 2025). Below action level
Highest since 2016: 3.1 ppb (Dec 2016).
| Monitoring period | Lead (90th pct.) |
|---|---|
| Jan 2023 – Dec 2025 | 0 ppb |
| Jan 2020 – Dec 2022 | 0 ppb |
| Jan 2017 – Dec 2019 | 0 ppb |
Earlier results (9)
| Jan 2014 – Dec 2016 | 3.1 ppb |
| Jan 2011 – Dec 2013 | 0 ppb |
| Jan 2008 – Dec 2010 | 0 ppb |
| Jan 2005 – Dec 2007 | 2 ppb |
| Jan 2004 – Dec 2004 | 3 ppb |
| Jan 1997 – Dec 1999 | 3.7 ppb |
| Jan 1996 – Dec 1996 | 4.2 ppb |
| Jul 1993 – Sep 1996 | 4.2 ppb |
| Jul 1993 – Jun 1995 | 7 ppb |
Lead comes from pipes and fixtures, not the source water, so it varies home to home. The 90th percentile means 9 in 10 sampled homes were at or below it. More on lead.
Violations
| When | What happened |
|---|---|
| Oct 2016 – Jan 2023 10 times | The running annual average for TTHM was above the legal limit. EPA record: TTHM · Maximum Contaminant Level Violation, Average · measured 0.082 mg/l (limit 0.080 mg/L) Resolved |
Health-based violations mean a contaminant exceeded a limit or a required treatment step was missed. Monitoring and reporting violations mean required tests or reports were late or missing, so the water's quality during that time is unknown. The total includes every violation in EPA's records, most of them paperwork.
Where it serves
McCormick
ZIP codes the system reported serving: 29821, 29824, 29835, 29838, 29840, 29844, 29845, 29848
Nearby utilities
- City of Abbeville Abbeville · 19 mi · PFAS above limit
- Greenwood Commission of Public Works Greenwood · 21 mi · PFAS above limit
- Saluda Commission of Public Works Saluda · 30 mi · PFAS above limit
- Saluda County Water & Sewer Authority Saluda · 30 mi · PFAS above limit
- Town of Ware Shoals Ware Shoals · 33 mi · PFAS above limit
- Town of Honea Path Honea Path · 37 mi · PFAS above limit
Questions
Is McCormick County Water & Sewer Authority water safe to drink?
McCormick County Water & Sewer Authority had 10 health-based violations since 2016, all since resolved. EPA testing found PFAS above the 2024 federal limits, which systems must meet by 2029. Federal data can't tell you about your own pipes: lead comes from service lines and plumbing, so test your tap if your home was built before 1986. For the official word, read the utility's annual Consumer Confidence Report.
Does McCormick County Water & Sewer Authority water have PFAS?
Yes. EPA's 2023–2025 testing of McCormick County Water & Sewer Authority found 5 PFAS at least once. The highest entry-point averages were above the federal limit for PFOS: PFOS 7.88 ppt (limit 4 ppt for PFOA and PFOS, 10 ppt for the others).
What is the lead level in McCormick County Water & Sewer Authority water?
The most recent 90th-percentile lead result for McCormick County Water & Sewer Authority is 0 ppb, for the period ending Dec 2025. The federal action level is 15 ppb, falling to 10 ppb in November 2027. The 90th percentile means 9 in 10 homes sampled were at or below this number. Individual homes can be higher.
Check these numbers yourself
Every figure on this page comes from public EPA records. You don't have to take our word for it:
- EPA's own report for SC3520002: violations, enforcement and inspections, straight from EPA.
- EPA UCMR 5 data: the PFAS and lithium results (search the file for PWSID SC3520002).
- EPA SDWIS download: the lead results, population and violation records we use.
- The utility's annual water quality report (Consumer Confidence Report): ask McCormick County Water & Sewer Authority at (864) 852-2231, or see EPA's guide to finding it.
Found something that doesn't match? Tell us and we'll check it against EPA's records. How we check our data.
Source: U.S. EPA drinking water records and PFAS testing (UCMR 5). How we read the data.